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A junction that connects a controlled-access facility to a lower-order facility, such as an arterial or collector road. [4] The mainline is the controlled-access highway in a service interchange, while the crossroad is the lower-order facility that often includes at-grade intersections or roundabouts, which may pass over or under the mainline. [5]
The Four Level Interchange of Arroyo Seco Parkway and Highway 101, looking northeast, in Los Angeles, California. It was the first stack interchange in the world. Highway Interchange between Dolphin Expressway and Palmetto Expressway (Dolphin–Palmetto Interchange) in Greater Miami, Florida, United States
Despite the construction of interchanges smoothing flow, 11 of the top 30 most congested stretches of highway in the U.S. are in Los Angeles. [4] Pregerson Interchange in Los Angeles. Alemany Maze; Dosan Ahn Chang Ho Memorial Interchange; East Los Angeles Interchange; El Toro Y, at convergence of I-405 with I-5, in El Toro, California. This was ...
A diverging diamond interchange (DDI), also called a double crossover diamond interchange (DCD), [1] [2] is a subset of diamond interchange in which the opposing directions of travel on the non-freeway road cross each other on either side of the interchange so that traffic crossing the freeway on the overpass or underpass is operating on the ...
Four-way stops are an effective way to keep drivers safe on the road. According to the N.C. Department of Transportation, on average, converting intersections into four-way stops — also called ...
The Four Level Interchange (officially the Bill Keene Memorial Interchange) is the first stack interchange in the world. [1] Completed in 1949 and fully opened in 1953 at the northern edge of Downtown Los Angeles, California, United States, it connects U.S. Route 101 (Hollywood Freeway and Santa Ana Freeway) to State Route 110 (Harbor Freeway and Arroyo Seco Parkway).
An overpass, called an overbridge or flyover (for a road only) in the United Kingdom and some other Commonwealth countries, is a bridge, road, railway or similar structure that is over another road or railway. An overpass and underpass together form a grade separation. [1] Stack interchanges are made up of several overpasses.
The first cloverleaf interchange patented in the US was by Arthur Hale, a civil engineer in Maryland, on February 29, 1916. [3] [4]A modified cloverleaf, with the adjacent ramps joined into a single two-way road, was planned in 1927 for the interchange between Lake Shore Drive and Irving Park Road in Chicago, Illinois, but a diamond interchange was built instead.